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3 Sheets-Sheet 1.

O. A. GREENLEAF.

Turn Table.

m MM m Z Patented Nov. 23, 1880.

Y 3Sheets-Sheet 2. 0. A. GREENLEAF.

Turn Table.

No. 234,668. Patented Nov. 23,1880.

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a. O 0 O O O O 0 O O O-O O O O O 3Sheets-Sheet s. G. A. GREENLEAF.

Turn Table.

Patented Nov. 23,1880.

N.FETERS. PHOYO-LITHOGRAPMER WASH NGYON D C Unirrn TU RN-TAB LE.

SPECIFICATION forming part of Letters Patent No. 234,668, dated November 23, 1880.

Application filed January 3, 1880.

To all whom it may concern:

Be it known that I, GLEMENTs A. GREEN- LEAF, of the city of Indianapolis, county of Marion, and State of Indiana, have invented certain new and useful Improvements in Turn- Tables, of which the following is a specification.

The first feature of myinvention is applicable to those classes of turn-tables which turn upon a central pivot or pivotal device, are mainly supported thereon and are arranged to tip-that is, oscillate upon such said central pivotin such a manner that when the weight of the locomotive is balanced upon said central pivotal devices, the ends of the track on the turn-table are freed from all connections with the tracks in the yard surrounding and running to the turn-table, and consequently the turntable is free to turn and be rotated withoutimpediment. Thesetablesnow constructed are always provided at their outer extremities with rollers or wheels, that make the end support of the table while the engine is being run off and on the table and also serve as a protection to prevent the table from upsetting while being turned around, by resting when the table tips in their direction upon an annular pathway. This annular track or pathway must be very close to the wheels and be maintained at a very perfect level, and in order to be thus maintained the foundation of this pathway must be solid and of such a suflicient depth as to be below the frost-line, and involves great expense in setting the table.

The second feature of my invention consists in the application of a locking device to the tippin g-j ointthat is, the joint or device which allows the table to tip-in such a manner that the load may be wholly borne upon the conical rollers or turning-joint at all times except while the engine is being run on and off the table, thereby preventing any oscillation of the table, and also preventing the friction occasioned in the present construction of table by the wheels bearing at times upon the pathway while the table is being turned.

One of the objects of my invention, to wit, the dispensing with said annular foundation and the wheels or rollers which roll thereon, is thereby obtained in a cheap, economical, durable, and safe manner, and the aggregate cost of the table and setting the same is diminishe'd one-third.

Other advantages of this part of my invention are, first, that a turn-table to which my locking device is applied can be constructed without a pit, and enabling a turn-table to be constructed in places where a pit cannot be dug, such as in prairies and places where no drainage can be obtained second, such a turntable is exceedingly portable and can be easily and quickly moved from point to point, as desired, making it of special advantage in the construction of new roads.

In dispensing with the pit I also obviate the dangers and inconveniences incident to its presence by day and night in the railroadyard, and obviate the expense of decking over the pit to prevent accidents occurring from partiesfallingintoit. Obviouslytheparticular form of lock which may be applied to look, as aforementioned, the tipping-joint of the turntable, may be varied and altered at will and yet come within the scope of this feature of my invention, as I do not limit myself, so far as this feature of my invention is concerned, to the particular forms of central post or pivot hereinafter shown and described.

For the purposes of this application I have illustrated the preferable form of locking device, as being applied to a central pedestal and tipping devices, also of myinvention, which combination of elements forms another feature of my present invention.

In the accompanying drawings, making a part of this specification, Figure 1 is a side elevation of a gallows frame pin connection turn-table, requiring no pit. Fig.2 is a central transverse section of said table. Fig. 3 is a section taken through the dotted line 00 00 of Fig. 2. Fig. 4 is a central vertical transverse section of an under truss or pit turn-table.

In the device represented in Fig. 4, A represents the foundation or 'center pier. B is the conical post or pedestal, firmly secured to the foundation by bolts B, and provided with a concave top, 0, as shown. In this top rests roller-block D, having a convex bottom, E, fitting into said top 0. In the top of roller-block 1) is an annular channel, F, beveled upward toward the center of the block, and which holds conical rollers Gr, upon which the cap H volve conical rollers G.

rests. The rollers revolve in this channel, and also in a channel, I, in the under side of cap H, the bed ofthe channel I being beveled downward toward the center of the cap. This cap is connected in any suitable manner to the turn-table. In the present figure J represents cross sections of two truss beams, properly connected by a box or central frame, K. In this figure I show a locking device applied at the center of the tipping-joint. Through the vertical center of roller-block D extends an orifice, L, which is continued through the center of the top 0 of pedestal B. The orifice is continuously tapering from top to bottom. This orifice is provided with a tapering lock pin or bolt, M, which, when dropped, fits tightly against the walls of the orifice L, and prevents any tipping of the table. This lockbolt M is elevated and depressed by any suitable means. In this figure it is raised or lowered by hand by means of a stem, N, passing up through and beyond a hole, 0, in the center of the cap H,and provided at the top with a handle, P. The hole 0 should be considerably larger than the stem N, and the stem N must extend above the cap H, so that the handle will not touch the cap, in order to prevent additional friction when the table is turned. The space between the upper end of the lock-bolt M and the lower side of the cap must be sufficient to allow the lock-bolt to be raised without coming into contact with the cap. When the lockbolt M is lifted the roller-block is allowed to tip slightly, and the table thus tips sufficiently to permit the load to be run off or on the table. While this Figure 4 shows a pedestal, rollerblock, rollers, and cap-that is to say, the center support of an under truss or pit tablethis center is applicable to any other description of turn-table.

The device for locking the tipping -joint (shown in Figs 2 and 3) consists of a lock pin or bolt, M, continuously tapered from top to bottom, and fitting in a tapered orifice in cap U, and rollerblock D, as shown. The top of this lock-bolt M, or an extension thereof, is provided at a point directly above the cap with an eccentric-yoke, V, in which turns an eccentric-shaft, \V, journaled in pillow-blocks m, attached to the cap U. To each end of the shaft W is attached a crank, Y, by which the shaft is turned and the loclcbolt elevated or depressed. Elevating the lock-bolt M allows the cap U to tip slightly and the table to tip sufficiently to enable the load to be run off and on the table, and depressing the lock bolt M-locks the tippingjoint and holds the table on a level. These Figs. 2 and 3 give another illustration of how this second feature of my invention is centrally applicable to a turn-table center of different construction from that shown in Fig. 4. In these figures the top of the pedestal is provided at the center with a dowel, S, around which fits an annular groove, F, in which re- The bottom of the roller-block is provided at center with a dowel, S, around which fits an annular steel ring, R,

provided with a groove, I, in which revolve the conical rollers G, by which the roller-block D is supported. The block I) is convex above, and on it fits a concave cap, U, which forms the tipping-joint.

In the device shown in Fig. 4 the grooves F and I may be in annular plates suitably attached, the plate containing groove F being connected to roller-block D or its extensions, and the plate containing groove I being connected to cap H and its extensions.

A very preferable form of turn-table which my invention renders capable of being employed where no pit is wanted is shown in Fig. 1to wit., a gallows-frame and pinconnection, in which 13 13 are posts, 14 are the bottom chords, 15 are the steel pins connecting the tie-bars 16 to the chords; 17 are the cross-ties framed into the chords and supporting the beams 18, which support the rails 22.

When my device for locking the tippingjoint is employed a very convenient method of making the connection between theturntable and the track 20, leading to the table, is as follows: The chairs 25, which support those ends of the rails 20 which are adjacent to the turn-table, project beyond the ends of said rails and toward the turn-table, and serve as guides and holders for those ends 21 of the rails 22 of the turn-table which project beyond the edge of said table when the table has been tipped down and while the load is being run off or onto the table. The chairs at such time'prevent lateral displacement of the rails 22 of the turn-table, and also serve as a support for the table.

One form of turntable center is shown in Figs. 2 and 3 as applied to the form of turntable shown in Fig. 1. The form of center shown in Fig. 4 is also applicable to said gallows-frame and pin-connection, and also to numerous other forms of table.

I do not limit my application of the combination of a tipping-joint and a device for locking the same to one particular form of truss or turn-table, but claim its application to any form of turn-table to which it may be applicable.

WVhat I claim as new and of my invention, and desire to secure by Letters Patent, is-

1. The combination of the tipping-joint located at the center of the turn-table, and a device for locking the same, substantially as and for the purposes set forth.

2. The combination of the pedestal B, provided with concave U, roller-block D, groove F, rollers G, groove I, cap II, lock-bolt M, stem N, and handle P, substantially as and for the purposes set forth.

3. The combination of the pedestal B, provided with concave (J, roller-block D, groove F, rollers G, groove I, and cap H, substantially as and for the purposes specified.

OLEMENTS A. G-REENLEAF.

Attest:

J. GILLIYAN, JNo. W. STREHLI.

IIO 

